The bimetallic thermometer should be pay attention to the application of error

Bimetallic thermometer and the rod of glass liquid thermometer USES similar, but can be used under the condition of higher mechanical strength. And have waterproof, corrosion resistance, vibration resistance, intuitive, easy reading, no mercury pollution, strong and durable, etc. Alternative to many other forms of thermometer table, widely used in petroleum, chemical industry, machinery, ships, electricity, textile, printing and dyeing, food and other industrial and scientific research departments. Practical application to protect one gr18ni9ti stainless steel and molybdenum titanium tubes, pressure and corrosion ability. Dial structure forms are: the axial, radial and 135 degree type, universal type varieties, suitable for all kinds of the needs of the installation. Should be paid attention to in the use and maintenance: bimetallic thermometer in custody, installation, use and transportation process, should try to avoid collision protection tube, don't make the protection tube bending, deformation. When installation, it is forbidden to twist the instrument shell. Fortunately - meter * Within the ambient temperature of 30 ℃ ~ 80 ℃. Bimetallic thermometer is when a bimetallic strip feel the temperature change, the pointer can be on a circular dividing scale indicates that temperature, can be directly read data, very intuitive and convenient. Therefore, Shanghai automation instrumentation WSS - three factory 481 bimetallic thermometer application range is very wide, such as petroleum, chemical, machinery, shipbuilding and other fields. But need to pay attention to in the application of double metal error, so as not to affect the accuracy of the measurement results. Then we have to get to know the application of the bimetallic thermometer myth. 1, high temperature range: bimetallic thermometer temperature range is 200 ~ 650 ℃, permissible error are about 1% of the scale range. In fact this is wrong, because, this made of metal spiral roll shape of thermal conductivity sensor, under the condition of 650 ℃ high temperature fatigue, temperature difference is very big, so when the temperature exceeds 550 ℃, should consider the thermocouple is used to solve this problem. 2, low temperature range bimetallic thermometer temperature range is 200 ~ 650 ℃ ( This is not correct) * low temperature can be measured to - 40℃。 In fact this is not much, because, bimetallic thermometer in - usually a kind of temperature calibration in production 20℃